Logano G334X Installation And Service Instructions Manual - page 23
6
Placing the heating system in operation
Logano G334X – 6 720 811 237 (2014/05)
23
10.The burner controller must generate ignition sparks towards the pilot
burner. The ignition flame must appear and then ignite the main
burner.
If the main burner does not ignite: Close the gas shutoff valve,
disconnect heating system from the power supply and inform your
customer service technician or gas supply company.
11. Once the main burner has ignited, the gas valve must be checked for
leaks with leak detector fluid. If no leaks are found, continue with
step 10.
12. If leaks are found, switch the ON/OFF switch on the gas shutoff valve
[1] clockwise to the OFF position. Disconnect heating system from
the power supply and set the thermostat to the lowest setting.
Seal the leaks. Repeat steps 1 and 2.
For aquastat controllers, continue with steps 3 and 4; for
Logamatic 2107 controllers, continue with steps 5 and 6.
Then repeat steps 8 to 11 regardless of the controller used.
Fig. 31 Gas valve
[1]
ON/OFF knob (in ON position)
[2]
Screw plug for gas supply pressure test port
[3]
Safety screw for the orifice pressure setting
[4]
Screw plug for orifice pressure test port
[5]
Safety screw for the pilot orifice pressure setting
13. Check the gas supply pressure while the boiler is operating. The
supply pressure for natural gas must be between 7" and 10.5" W.C.
(17.4 to 26.2 mbar) and between 11" and 13" W.C. for propane gas
(27.4 to 32.4 mbar). Record the values measured in the
commissioning report (
page 26).
14. Check nozzle pressure. Set the orifice pressure according to Tab. 13
while the boiler is operating. To do so, remove the safety screw for
adjusting the orifice pressure [3] from the gas valve. Turn the
adjustment screw clockwise to increase the orifice pressure. Turn
the adjustment screw counterclockwise to decrease the pressure.
15. Record the value set in the commissioning report (
Chapter 6.8,
page 26). Screw the safety screw for adjusting the orifice pressure
[3] back into the gas valve.
16. Observe ignition flame through the inspection hole in the burner
cover (
Fig. 30, page 22).
17. The flame must surround the flame rod by 1/2...1 1/2 inches
(15...40 mm). If this is the case continue with step 20.
Fig. 32 Correct ignition flame setting
[1]
1/2 to 1 1/2 Inches (12.7 to 38.1 mm)
[2]
Ignition flame
18. If the ignition flame is too small or too large, the pilot orifice pressure
must be adjusted with the corresponding adjustment screw.
19. Remove the safety screw for the pilot orifice pressure setting
(Fig. 31, [5], page 23). Turn the inner adjustment screw clockwise
to reduce the ignition flame and counterclockwise to enlarge the
ignition flame.
20. After adjustment, tighten the safety screw for the pilot orifice
pressure setting (Fig. 31, [5], page 23).
21. Observe ignition flame [1] through the inspection hole in the burner
cover (
Fig. 30, page 22). The flame must have a steady and fixed
contour and generally has a bluish color.
If the main burner flame has the proper appearance, continue with
step 21.
If the main burner flame is too weak, yellow or goes out, turn the
ON/OFF knob on the gas shutoff valve clockwise to the OFF position
(
Fig. 30, [1], page 22). Close the gas shutoff valve, disconnect
heating system from the power supply and inform the customer
service technician or gas supply company.
Boiler size
Natural gas
Propane
[inches W.C.]
[mbar]
[inches W.C.]
[mbar]
73
4.4
10.9
10.4
25.9
92
4.4
10.9
10.3
25.7
116
4.1
10.2
10.3
25.7
132
4.2
10.4
10.2
25.4
Table 13 Orifice pressure
The adjustment screw is located behind the safety screw
for the pilot orifice pressure setting (
Fig. 31, [5]).